Every screen so far has worn the baseline Material 3 15,533 look, purple and lavender, the Compose 234 equivalent of an HTML page with the browser's default stylesheet. Material 3 (androidx.compose.material3 1.4.0 in Compose BOM 2026.09.00) is Google's design system for Android, and a theme is just a composable that puts colors, type and shapes into composition locals that every component below reads. Change them once and every button, card and chip follows, in light mode, dark mode and the user's wallpaper colors: the native version of Framework7 572,986 's CSS variables (Framework7).
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Material 3 and Theming
Material 3, Theming and Dark Mode